High-pressure soft X-ray absorption spectroscopy:: application of a new in situ spectroscopic method in catalysis research

被引:24
作者
Hävecker, M [1 ]
Knop-Gericke, A [1 ]
Schedel-Niedrig, T [1 ]
机构
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
关键词
soft X-ray absorption spectroscopy; catalysis research; in situ spectroscopic method;
D O I
10.1016/S0169-4332(98)00731-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In situ investigations under real reaction conditions are necessary since the structure of catalysts can be very different from that found post mortem or ex situ. The object of this research was to demonstrate the use of an X-ray absorption spectroscopy (XAS) detector system that is suitable for in situ investigations in the soft X-ny range of 250 less than or equal to h nu less than or equal to 1000 eV under gas/solid reaction conditions close to those used in practice. As an example, the conversion reaction of methanol over copper catalysts is studied under reaction conditions (T greater than or equal to 500 K, p greater than or equal to 0.5 mbar). A novel atomic oxygen species is found under reaction conditions characterized by chemical functionality that is significantly different from copper oxide surfaces found in the ex situ spectroscopic analysis which contain oxygen atoms interacting strongly with copper 3d states. (C) 1999 Elsevier Science B.V, All rights reserved.
引用
收藏
页码:438 / 442
页数:5
相关论文
共 17 条
[1]  
BRIGGS D, 1983, PRACTICAL SURFACE AN
[2]  
Burch R., 1991, CATALYSIS TODAY, V9
[3]   INSITU HIGH-PRESSURE, HIGH-TEMPERATURE XAFS STUDIES OF CU-BASED CATALYSTS DURING METHANOL SYNTHESIS [J].
CLAUSEN, BS ;
TOPSOE, H .
CATALYSIS TODAY, 1991, 9 (1-2) :189-196
[4]   A COMBINED QEXAFS XRD METHOD FOR ONLINE, IN-SITU STUDIES OF CATALYSTS - EXAMPLES OF DYNAMIC MEASUREMENTS OF CU-BASED METHANOL CATALYSTS [J].
CLAUSEN, BS ;
GRABAEK, L ;
STEFFENSEN, G ;
HANSEN, PL ;
TOPSOE, H .
CATALYSIS LETTERS, 1993, 20 (1-2) :23-36
[5]   A HIGH-FLUX TOROIDAL GRATING MONOCHROMATOR FOR THE SOFT-X-RAY REGION [J].
DIETZ, E ;
BRAUN, W ;
BRADSHAW, AM ;
JOHNSON, RL .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1985, 239 (02) :359-366
[6]  
Hävecker M, 1998, ANGEW CHEM INT EDIT, V37, P1939, DOI 10.1002/(SICI)1521-3773(19980803)37:13/14<1939::AID-ANIE1939>3.0.CO
[7]  
2-T
[8]  
Havecker M., 1998, ANGEW CHEM, V110, P2049
[9]  
Knop-Gericke A, 1998, NUCL INSTRUM METH A, V406, P311, DOI 10.1016/S0168-9002(98)91991-X
[10]  
NEISIUS T, UNPUB PHYS REV B